Section
4
TM 9-2320-363-20-1
TROUBLESHOOTING
CHARTS
E. CODE 21-
THROTTLE
POSITION
SENSOR
(TPS) SIGNAL
VOLTAGE
HIGH
(Cent’d.)
21-9
Check
ECM
Connectors
l Check terminals at the ECM vehicle
harness connector
(both the ECM
and harness side) for damage;
bent, corroded,
and unseated
pins or sockets.
21-30
Verify
Repairs
l Turn ignition off.
l Reconnect all connectors.
l Turn ignition on.
l Clear codes.
l Note status of “Check Engine”
light.
l If “Check Engine"
light does not
stay on, start engine and run until
“Check Engine” light comes on
or 1 minute. Stop engine.
l Read all codes.
RESULT
WHAT TO DO NEXT
Terminals and
Replace ECM, page 4-192.
connectors are okay.
Then go to 21-30.
Problem found.
Repair terminals/connectors,
page 3-2. Then go to 21-30.
Code 25 (no codes).
Repairs
are complete.
Code 21 (and
All
system diagnostics
are
any other codes).
complete.
Please review this
section from the first step to find
the error.
Any other codes
Go to START-1, page 3-121,
except Code 21.
to service other codes.
3-227
